This app provides integration with Apache Solr, the popular open source enterprise search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, rich document (e.g., Word, PDF) handling, and geospatial search. Solr is highly scalable, providing distributed search and index replication, and it powers the search and navigation features of many of the world's largest internet sites. On installing and enabling this app, Liferay Portal uses Solr for indexing and searching.

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You can find a SOLR 4.3 working version here http://ntrpigo.blogspot.it/2014/08/integrating-solr-43-into-liferay-6.html. The repository includes also SOLR 1.4.1 and 3.3.0 versions and it's compatible with, at least, Liferay 6.1 and 6.2.

works pretty good but there are some weird stacktraces. Also only works on solr 1.4, solr 4 is out. You can make it work with 3.6 solr but requires you to write a model, since there is no doc its a lot of trial and error.